Growing breasts often feel like tenderness, soreness, itching, or tingling in the chest, with the first sign being a small, hard bump (breast bud) under the nipple that can be sensitive to touch. This discomfort happens as skin stretches and hormones cause breast tissue and ducts to develop, sometimes making nipples swell or become erect, and it's normal for one breast to grow faster.
Buds appear, and breast and nipple are raised. The dark area of skin around the nipple (the areola) gets larger. Breasts are slightly larger, with glandular breast tissue present. The areola and nipple become raised and form a second mound above the rest of the breast.
Many young women experience pain as their breasts grow and this is nothing to worry about. Breasts develop as the hormones estrogen and progesterone are released at puberty. These hormones make the breast tissue grow. As it does, the surrounding skin may stretch, which is one reason breasts can hurt when they grow.
Some of the most common symptoms of breast hypertrophy are:
For a 14-year-old, the average bra size often falls in the range of 32A to 34B, though this varies greatly as breast development happens at different rates, with many teens starting smaller (AA/A cups) and moving towards B cups as they mature. A helpful starting point for sizing involves measuring your band size (under the bust) and bust size (fullest part), then using a standard formula, but remember that frequent measuring is key due to rapid changes during puberty.
Asian and African nations have the smallest, with predominantly B and A cup sizes being most common. Australia is way down the list: in 2020, the most common Australian bra sizes are reported to be 14C and 12D, and while this is the average across all ages, there really is no such thing as the “average” woman.
If you have sensitive skin and larger breasts, going braless will allow your skin to breathe better and can prevent skin irritation. If you stop wearing a bra your skin health in your chest area may improve, especially if you often experience body or back acne.
The only way to permanently change breast size is through cosmetic surgery, which comes with its own risks (and expense). Doctors usually prefer that girls wait until development is complete before getting surgery.
Small breasts are usually due to genetics, hormones, and body fat, but can also be affected by weight loss, age (menopause), or pregnancy, with factors like clothing fit influencing appearance; if you have sudden changes or concerns, a doctor can rule out conditions like micromastia or hypothyroidism.
Typically, breast development begins around age 8 to 13, with the most rapid growth occurring during early adolescence. By the age of 15 to 17, most girls have reached their adult breast size, although some may continue to experience minor changes into their early twenties.
The first sign of puberty for girls is breast development or breast budding. You may hear your doctor use a fancy term for this called thelarche. If you don't notice breast budding by the age of 13 you should be sure to have a check-up with your pediatrician or adolescent medicine doctor.
As your body develops, you might hear all sorts of rumors, like touching or massaging breasts makes them grow. That's not true. There's plenty of wrong information out there about breast development. Some are cons, like creams or pills that claim to make breasts bigger (they don't).
While it's really difficult to precisely determine the standard breast size in the U.S. (or anywhere in the world, for that matter), we do know that the average breast size in America is a 34DD.
It affects most women at some time in their lives. The degree of soreness, and where and how it is felt, differs for each woman. It might be sharp, stabbing, dull, throbbing or aching. It might be felt in all or part of the breasts, one breast or both.
Hormones play a central role in breast development. Estrogen triggers breast growth during puberty and pregnancy, while fluctuations related to birth control, menstruation, or hormone therapy can also affect breast size. Breastfeeding and milk production can temporarily enlarge the breasts as well.
Signs of Full Development
The short answer is yes, but not in a predictable or permanent way. Some women do notice an increase in breast size when they gain weight. Others notice little to no change at all. And for many, any increase disappears once the weight comes off.
Body size and shape can frame how large or small the breasts might appear, so breasts that appear small on a person with a taller, stockier or broader frame will look considerably bigger on a woman who is more petite.
Hormonal changes: Fluctuations in hormones like estrogen and progesterone can cause breast tissue to grow. This often happens during menstrual cycles, pregnancy, or when starting or stopping hormonal birth control.
The rarest cup sizes are at the extreme ends of the spectrum, such as AAA, AA (especially with small bands like 28AA, 30AA), and very large sizes like G, H, and beyond (e.g., 28G, 30G, 36G), as stores focus on common core sizes (32-38 bands, A-DD cups) and these extremes are harder to find in mainstream retail but available from specialty brands. While 32A seems common, true 32A fit is rare, as many women need smaller bands or different cup volumes, making smaller/larger true sizes less represented in general stock.
Numerous factors influence breast size, from age and ethnicity to your diet and the number of pregnancies you've had. Inevitably, genetics also play a big part, in much the same way as it determines your height or shoe size.
Healthline notes that no food, diet, supplements, pumps, or creams are proven to increase breast size. However, exercises targeting the chest, back, and shoulders can enhance breast appearance. For those wondering how to increase breast size in 7 days, exercises may provide subtle improvements with consistent effort.
The "3 bra rule" is a guideline recommending you own at least three bras for a simple rotation: one to wear, one to wash, and one to rest (in the drawer), allowing elastic to recover between wears to extend the bra's lifespan and maintain fit. This system prevents wearing the same bra daily, which stretches out the elastic and reduces support, helping bras last longer.
Sagging itself can happen prematurely purely due to genetics. If none of these factors are present though, the breasts tend to start sagging around the same time as the face, though it can be slightly after. This usually happens somewhere between the ages of forty and sixty.
There are no health risks associated with going braless, Dr. Blake says. “It's OK to do whatever is comfortable for you,” she encourages.